Rotary tool



July 7, 19: 6. H. c. REYNOLDS v 2,046,412

ROTARY TOOL Filed July 5, 1955 IN VEN TOR.

4Z9; 411 Hvg/ddlfeyaolds MM 4 5W T 4/4, H15 AT ORNEY Patented July 7, 1936 ROTARY TOOL Harold C. Reynolds, Athens, Pa., .assignor to Ingersoll-Rand Company, Jersey City, N. J., a corporation of New Jersey Application July 5,

1935-, Serial No. 29,811

4 Claims. (01. 74-354) This invention relates to rotary tools, and. more particularly to a reversing mechanism for tools of this type.

One object of the invention is to transmit and translate the rotary movement of a uni-directional motor to a .driven shaft for driving it in either direction.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing accompanying this specification and. in which similar reference numerals refer to similar part-s,

Figure l is an elevation, partly insection, of a rotary tool equipped with reversing mechanism constructed in accordance with the practice of the invention,

Figure 2 is a transverse view taken through Figure l on the line 2--2 showing the reversing mechanism in neutral position,v

Figure 3 is a view similar to Figure 2 showing the reversing mechanism in a holding position to connect the drive and driven shafts, and

Figure 4 is an elevation, in section, taken through Figure 3 on the line 4-4.

Referring more particularly to the drawing, 29 designates a rotary tool comprising a pair of easing parts 2| and 22 which may be connected together in end to end relationship by bolts 23. The casing 22 constitutes a front head for the rotary tool, and on the rear end of the casing 2| is a back head 24 having a grip portion 25 wherein is arranged a throttle lever 26 to control the admission of power medium, such as compressed air, into the tool.

The rear end of the casing 2| serves as a housing for a motor 21 of the uni-directional pressure fluid actuated type. The motor comprises a cylinder 28 and a rotor 29 having a shaft 39 which extends forwardly of the cylinder 28 and into a gear chamber 3| in the casing 2|. In the rotor 29 are a series of slots 32 to accommodate vanes 33 against which pressure fluid may act for actuating the rotor.

The portions of the shaft 39 extending beyond the ends of the rotor 29 may be seated in antifriction bearings of which one, designated 34, is arranged in an internal wall 35 in the casing 2|.

Clamped between the casing parts 2| and 22 is a plate 36 having a hub portion 3'! which is recessed in its opposite ends to receive anti-friction bearings 38 for a driven shaft 39 which extends forwardly through the casing 22 and may terminate in a shank 40. The shank 40 extends into a socket 4| of a working implement 42 and a pin 43 keys the working implement to the shank.

The working implement 42 is shown as being in the form of a socket wrench adapted to engage a nut 44 threaded on a bolt 45. Preferably,-the shaft 39 is arranged coaxially with the shaft 30, and suitable bearings (not shown) may be arranged in the front end of the casing 22 to support the shaft 39.

The reversing mechanism, constructed in accordance with the practice of the invention, is conveniently arranged Within the-gear chamber 3! to oscillate about a transmission shaft 45' of which the ends are arranged in anti-friction bearings 41 seated in the wall 35 and the plate 36.

The shaft 45 carries a gear 48 which is in constant mesh with a pinion 49 on the rotor shaft 39, and on an intermediate portion of the shaft 45 is a pinion 59 to mesh with transmission gearing adapted to connect the pinion 50 with a gear 5| on the rear end of the shaft 39.

The transmission gearing is carried by a support plate 52v journalled in the casing 2| and comprises a plurality ofidler gears 53, 54 and 55 grouped about the pinion 59. Each pinion '53, 54 and 55 is rotatable about a shaft 56 seated in the support plate 52, and the pinion 53 is in constant mesh with the pinion'59 and positioned to be shifted into intermeshing engagement with the gear 5|. The idler gear 54 meshes with the pinion 50 and the gear 55, and the latter gear is positioned to mesh with the gear 5| in a limiting position of the plate 52.

The support plate 52, which is adapted to oscillate about the shaft 46 to bring the gears 53 and 55 into mesh with the gear 5|, is seated with its periphery in a recess 51 in the inner surface of the casing 2|. The plate 52 is of generally cylindrical shape and its peripheral surface may constitute a bearing surface 58 which seats against the side surface 59 of the recess 51.

On' the top of the plate 52 is a cover 60 to retain the gears 53, 54 and 55 within the plate 52 and also to serve as bearings for the upper ends of the shafts 56. The cover 60 is fastened to the plate 52 by screws BI and engages a shoulder 62, constituting a rear bounding surface of the recess 51, for retaining the plates 52 and 60 and thus the gears carried by the plate 52 in the correct assembled positions with respect 7 to the pinion 50 and the gear 5|.

Means are provided for shifting the support plate 52 in order to move the gears 53 and 55 into engagement with the gear 5|. The support plate 52 is accordingly provided with a radial slot'63 to accommodate and guide a shoe 76.4 which is bored to receive a pin 65 arranged eccentrically on a shaft '66 in the plate 36. On the outer end of the shaft 66 is a grip portion 6'! which lies exteriorly of the casing of the tool for shifting the plate 52.

On the free end of the pin 65 is a collar68 I to serve as a seat for a spring 69 disposed about the pin 65 and seating against the shoe 64 to normally hold the shaft 66 against endwise move-' ment.

To theend that theshoe 64, and .thus the plate52, maybe held in the limiting positions the-grip portion 61- is provided with a springpressed plunger '10 to engage indentations l and 12 inthe outer surface of theplate 36. The

indentations Hand 12 are so located that when the plate 52 is shifted to place the gear53 or the gear 55 in mesh with the gear the. plunger will engage one of the indentations 1| or112 to hold the shaft against unauthorized rotary movement. 7

The operation of the, device is as followsi Let it be assumed that the motor 21 is constructed in a direction bolt.

to rotate in a clockwise directiom-as the motor is .viewed from the operators position, and that it be desired to unthread the nutl44j from the a bolt 45. In such case the shaft BBVis rotated in a counter-clockwise direction for approximately a quarter of a turn from the neutral position il1ustrated in Figure 2. This movement of the shaft 56 causes the plate 52 to oscillate about the shaft 46 and thegear 53 to mesh with the gear 5|. The motor may'then be set in-operation and the resulting movement of the shaft 39 will efiect'the removal of .the nut 44 from the bolt 45.

Should it be desired to secure the nut 44 to the bolt the shaft- 66 is'rotated in a clockwise direction. This movement of the shaft will shift the plate 52 to bring thegear into mesh withthe gear 5| and to disengage the gear 53 from the gear 5| The shaft 39 will then rotate I claim: 1 q r -l. In a rotary tool, the combination of a-casing and a uni-directional motor, a bearing surface on the casing, a drive shaft driven by the in such limitm g' positions V o p I I 3. In a rotary toohthe ,combinationof a cas zs for threadingthe nut 44 to the motor and having a pinion, a driven shaft having 1 a. gear, a support member seated on the bearing surface and being shiftable in the casing, idler gears carriedby the support member and H being constantly 1 rotated by the pinion, and 6 means for shifting the support member on the bearing surface to selectively bring certain of; the idler gears into mesh with the first mentioned,

. gear for determining the direction of rotation.

of the driven shaft. 7 V V r ,2. In a rotary tool, the combination of a casing and a uni-directional motor, said casing hav- 1 l t ing a recess 'in its inner surface, a-drive shaft 5 driven by. the 'motor and having a pinion, a.

driven shaft. having a gear, a support plate seatt ed in and rotatable in the. recess, idler gears mounted on the support plate'and being rotated bythe pinion, and means for shiftingthe sup- 7 Port plate to limiting positionsto selectively bring the idler gears mm mesh with the first mentioned on- V g gear for determining the direction of {rotati of the driven shaft andto lockthesupport plate ing. and a' uni-directional motor, a drive" shaft,

1 driven. by the motor and having a pinion, a

driven shaft having a gear, a support plate roi tatable about the drive shaft, a bearing onlthe inner surface of the, casing. for the support; plate, idler gears mounted on the supportplate and 3 being rotated by thepinion, and means for rotat-J 7 ing the support plate to selectively bring certain being rotated by the pinion, a shoe slidable in the slot, and an eccentric member. for actuating V the shoe in the slot to rotatethe'plate and thereby selectively place certain of the idler gears in 45' mesh'with the first mentioned gear for determining the direction of rotation of thedriven shaft.

HAROLD C. REYNOLDS.

the direction of i r 35 V 0 Qidler gears carried by the support. plate and- 

